NATURAL SCIENCES OF PHILADELPHIA. 43 



The suboesopliageal ganglia consist apparently of six closely 

 agglomerated globules. There are two simple globules to the 

 stomacogastric ganglia. The genital system (pl.YIII. fig. 5) is quite 

 simple, presenting no accessory organs. The testicle is composed 

 of six or seven fasciculi of long cjieca, which massed together in a 

 globular form equal the length of the oviduct. This enormous 

 development of the testicle is the peculiarity of the genital sys- 

 tem, and no doubt will prove a reliable specific, but not generic, 

 character. The epididymis is long, convoluted at its middle por- 

 tion. The oviduct is long, narrow, not convoluted. The vagina 

 is about one-fifth the length of the oviduct ; it is swollen greatl}'- 

 at the entrance of the penis. The genital bladder is small, glo- 

 bular ; its duct is narrow, longer than the oviduct, and enters the 

 vaginp, at the upper fourth of its length. The penis sac is short, 

 stout, blunt at apex, where the vas deferens enters and where the 

 retractor muscle is also inserted. 



In the paper referred to above we hesitated to decide upon the 

 generic position of this species, leaving it temporarily in Fellicida 

 of Fisciier (not of Heynemann, which is Omah/nx). Since that 

 time I have become acquainted with the jaW of Amphibalima, and 

 find it to be of the same t3'pe as in ajypendiculata. I would, there- 

 fore, suggest that this species belongs to Amphibulima. It is true 

 its lingual dentition (see pi. VIII. fig. G) more closely I'esembles that 

 of Simpulopsis sulculosa as far as centrals, and perhaps laterals, 

 are concerned ; but in the marginals, as described in S. aulculoHa 

 and S. Portoricensis, the resemblance ceases. Moreover, the jaw 

 of Simpulopsis is described as quite different by Siiuttleworth. The 

 species under consideration cannot, therefore, be placed in Sim- 

 pulopsis. It appears, at all events, that the shell in this group is 

 an unreliable guide to generic position. 



It must be borne in mind that I here describe the anatomy of 

 the shell figured by us .(I.e.). We believe it to be Succinea ap- 

 pendiculata^ Pfr. Fischer bases his genus Pellicula on Succinea 

 depressa, Rang. He does, indeed, place S. appendiculata, Pfr., in 

 the s^ynonymj^ of his species, but our specimens of appendiculata 

 could never be the same as Fischer's specimens of depi^essa. His 

 bad a jaw with nine decided ribs, denticulating the cutting edge, 

 and teeth' of the usual form of Heliciiise, quite diflferent from what 



• In Fischer's plate the references to teeth of Omalonyx ungim and Pel- 

 licula depressa are reversed. 



